support gcp authentication refresh token

[jhbae200]

Related Issues:

• GCP authentication does not support refreshing tokens #290
• Proper way to connect to a GKE cluster in production. #1664

I wrote a "refresh" function because it seems to be using "cmd-path", "cmd-args", "expiry-key", "token-key" to refresh the token.
Need to check that it works on various os platforms.

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[yue9944882]

@jhbae200 thank you for kicking this off! can you resign your commit by properly setting up your git workspace?

git config user.name ..
git config user.email ...

[jhbae200]

/check-cla

[jhbae200]

/assign @yue9944882

[yue9944882]

@jhbae200 can you run mvn spotless:apply before submitting the changes? thanks!

[yue9944882]

wildcard import will fail the lint checker

[brendandburns]

I'm not sure that IOException is right here. IllegalStateException(...)?

[brendandburns]

Also, please make the message more descriptive and include the stderr to make the exception more debuggable.

String stderr = IOUtils.toString(process.getErrorStream(), StandardCharsets.UTF_8)
throw new IllegalStateException("Failed to get token (" + process.exitValue() + ") " + stderr

[brendandburns]

Some small comments. Generally looks good. Needs linter formatting to conform to the style guide.

[jhbae200]

Updated the code. am i right?

[brendandburns]

Code looks great.

Can you add a unit test for this new functionality (sorry, I should have mentioned that before).

Once it is tested (and passing) we can merge.

[jhbae200]

I think need to mock the ProcessBuilder to test the refresh method.
I'm trying to mock that function by adding a getProcessBuilder method to this class. What do you think?

public class GCPAuthenticator implements Authenticator {
//somthing code
  public ProcessBuilder getPb() {
    return new ProcessBuilder();
  }

  @Override
  public Map<String, Object> refresh(Map<String, Object> config) {
    //somthing code
      Process process = this.getPb().command(Arrays.asList(fullCmd.split(" "))).start();
    //somthing code
  }
}

[brendandburns]

Thanks for adding the test!

I think it is simpler if you just make the ProcessBuilder an optional constructor parameter, e.g.

public GCPAuthenticator() {
   this(new ProcessBuilder());
}

public GCPAuthenticator(ProcessBuilder pb) {
   this.pb = pb;
}
....

[brendandburns]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: brendandburns, jhbae200

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[piotom]

Great to have it implemented!

Are there any plans to release it in the near future?

[keith-miller]

It took me a while to discover that this existed and was released. Any chance this can be added to the documentation for those coming after me?

Thanks